diff --git a/src/osg/ApplicationUsage.cpp b/src/osg/ApplicationUsage.cpp
index 2b83c7241..df6800d38 100644
--- a/src/osg/ApplicationUsage.cpp
+++ b/src/osg/ApplicationUsage.cpp
@@ -72,8 +72,8 @@ void ApplicationUsage::getFormatedString(std::string& str, const UsageMap& um,un
         line.replace(optionPos,optionWidth,citr->first);
         
         const std::string& explanation = citr->second;
-        unsigned int pos = 0;
-        unsigned int offset = 0;
+        std::string::size_type pos = 0;
+        std::string::size_type offset = 0;
         bool firstInLine = true;
         while (pos<explanation.length())
         {
@@ -88,8 +88,8 @@ void ApplicationUsage::getFormatedString(std::string& str, const UsageMap& um,un
             
             firstInLine = false;
         
-            unsigned int width = minimum((unsigned int)explanation.length()-pos,explanationWidth-offset);
-            unsigned int slashn_pos = explanation.find('\n',pos);
+            std::string::size_type width = minimum((std::string::size_type)(explanation.length()-pos),(std::string::size_type)(explanationWidth-offset));
+            std::string::size_type slashn_pos = explanation.find('\n',pos);
             unsigned int extraSkip = 0;
             bool concatinated = false;
             if (slashn_pos!=std::string::npos)
diff --git a/src/osg/ArgumentParser.cpp b/src/osg/ArgumentParser.cpp
index 380040476..d1f11b22f 100644
--- a/src/osg/ArgumentParser.cpp
+++ b/src/osg/ArgumentParser.cpp
@@ -296,39 +296,14 @@ void ArgumentParser::reportRemainingOptionsAsUnrecognized(ErrorSeverity severity
             {
                 if (option[prevpos]=='-') 
                 {
-                    // verbose approach implemented for debugging string(const string&,unsigned int,unsigned int) operation on x86-64
-                    notify(INFO)<<"option=\""<<option<<"\" \tprevpos="<<prevpos<<" \tn="<<pos-prevpos<<"\tnpos="<<std::string::npos;
-
-                    std::string str(option,prevpos,pos-prevpos);
-                    
-                    notify(INFO)<<" \tstr=\""<<str<<"\"";
-                    
-                    options.insert(str);
-                    
-                    notify(INFO)<<" \tinserted into options set"<<std::endl;
-                    
-                    
-                    // original op which causes a crash under x86-64
-                    //options.insert(std::string(option,prevpos,pos-prevpos));
+                    options.insert(std::string(option,prevpos,pos-prevpos));
                 }
                 prevpos=pos+1;
             }
             if (option[prevpos]=='-') 
             {
 
-                // verbose approach implemented for debugging string(const string&,unsigned int,unsigned int) operation on x86-64
-                notify(INFO)<<"option=\""<<option<<"\"  \tprevpos="<<prevpos<<" \tn=npos="<<std::string::npos;
-
-                std::string str(option,prevpos,pos-prevpos);
-
-                notify(INFO)<<" \tstr=\""<<str<<"\"";
-
-                options.insert(str);
-
-                notify(INFO)<<" \tinserted into options set"<<std::endl;
-
-                // original op
-                //options.insert(std::string(option,prevpos,std::string::npos));
+                options.insert(std::string(option,prevpos,std::string::npos));
             }
         }
         
diff --git a/src/osgPlugins/directx/directx.cpp b/src/osgPlugins/directx/directx.cpp
index b8bc46618..88e65814d 100644
--- a/src/osgPlugins/directx/directx.cpp
+++ b/src/osgPlugins/directx/directx.cpp
@@ -241,11 +241,11 @@ void Object::readTexFilename(ifstream& fin, TextureFilename& texture)
             break;
 
         // Strip " if present
-        string line = buf;
-        size_t pos = line.find('"');
+        std::string line = buf;
+        std::string::size_type pos = line.find('"');
         if (pos != string::npos) {
-            size_t end = line.rfind('"');
-            int len = (end != string::npos ? (end-pos-1) : (line.size()-pos));
+            std::string::size_type end = line.rfind('"');
+            int len = (end != std::string::npos ? (end-pos-1) : (line.size()-pos));
             texture = line.substr(pos+1, len);
         }
         else